In pavlov's experiments, the meat powder (food) placed on the dog's tongue was the


answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

The speed of  sound:   sound travels  at different speeds depending on what it istraveling through. of the three mediums (gas, liquid, and solid)  sound waves travel the slowest through  gases, faster  through  liquids, and fastest  through  solids.

The best answer would be:

Unconditioned stimulus

In Pavlov's experiment on conditioning the food was the unconditioned stimulus that triggers a reflex or natural behavior. Think of it like something that makes you do something automatically.

For example, the food. When the dog smells food, it salivates. This is unconditioned because without teaching the dog, it automatically responds by salivating.

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